Bolt-anchor.



No. 725,278. Y PATENTBD APN. 14, 1903.

s. s. NEWTON. BOLT ANCHOR.

APFLIOATION FILED OGT.9.1902. NO MODEL. 2 SHEETS-SHEET 1.

E/'Uu/ O d). @M

NW@- www? PATENT-ED APR. 14, 1903.

S. S. NEWTON.

BOLT ANCHOR. APPLICATION FILED 0012.9. 1902.

2 SHEETS-SHEET 2.

no MODEL.

UNiTED STEPIIEN S. NEWTON, OF YORK, N. 'Y., ASSIGNOR TO .FREDERICK C. PALMER, OF BROOKLYN, NEV YORK.

SPECIFICATION forming part of Letters Patent No. 725,278, dated April 14, 1903.

Application filed October 9, 1902. Serial No. 126,392. (No modell) in a cavity in a Wall and surrounding a bolt..

Fig. 2 is an enlarged plan View of a semicylindrical section of such an anchor. Fig. 3 is a plan view of two sections of such an anchor whenA they have been stamped out of one piece of metal. Fig. 4 is a transverse section on the plane of the line 4 4 in Fig. 3. Fig. 5

is a side elevation of one of my improved bolt-` anchors provided with non-corrugated or non-` iiuted portions in place in a cavity in a wall and inclosing a bolt. Fig. 6 is an enlarged plan View of a semicylindrical section of this form of my bolt-anchor provided with walls of varying thickness. Fig. 7 is a plan View of two sections of such a bolt-anchor, each provided with non-corrugated portions `and stamped out of one piece of metal. Fig. 8 is a transverse section on the plane of the line` 8 8 in Fig. 7. Fig. 9 is a plan View 'of a section of the bolt-anchor, in which is shown placed a bolt the threads of which engage the corrugated portions thereof. Fig. 10 is a similar View ofthe same section, in which is shown placed a screw the threads of which are more numerous for the same length than those of the bolt shown in Fig. 9 .and which threads also engage the corrugated portions thereof.

In the drawings, l represents one of the sections of which my improved bolt-anchor is composed. It consists of a strip of suitable metal which has been pressed or cast into the form shown-namely, that of a semicylindrical body provided for the greater portion of its length with corrugations or flutings and also provided with a smooth or noncorrugated portion 2 near its outer end. The

corrugations or flutings consist of alternate elevations 3 and depressions 4, formed by squeezing, pressing,or casting the metal in any of the usual methods weil known.

I have represented in Fig. 2 one of the sections of my bolt-anchor, in which the thickness of its wall gradually increases from the outer end at 5 toward the inner end at 6.

In Fig. 3 I show sections of a bolt-anchor in which the wall is of substantially uniform thickness throughout. Either form of wall may be employed; but where heavy bolts are to be used and the cavities into which they are to be secured are large the sections the Walls of which are thicker at their inner ends are to be preferred.

The sections of which the walls are of uni; form thickness are preferably made by stamping them outof sheet metal. The result of such an operation is shown in Figs.. 3 and 4. Where this is done, the die employed will leave small joiningstrips 7 7 7 between adjacent elevations on the different sections and will cut out small portions of metal which filled the spaces S 8 S before the metal was stamped out. Y

Whether the walls of the sections be of uniform or of varying thickness,the corrugations are preferably made deeper toward the inner end of the anchor, as shown in Fig. 2. In fact, the best form to employ, in my opinion, is such that when the sections are assembled into tubes the outer edges of all of the elevations of the corrugations shall be tangent to the circulnscribed cylinder, as indicated by Vthe dotted lines 9 9, 9 9, and the inner edges of all of the depressions of the corrugations shall be tangent to the frustum of the inclosed cone,as indicated by the dotted lines 1o 1o, 1o io. l

The construction in which'the Walls of the anchor are of uniform thickness is by a requirement of the Patent Office divided out of this application and made the subject-mat ter of an application for Letters Patent of theI United States filed by me on the 23d day of December, 1902, Serial No. 136,419.

I have shown the sections 1 1 provided with non-corrugated portions 2 2 at their outer ends. I prefer this form Where bolts are to be anchored, because it is adapted best to en- IOO gage the smooth shank l1 of such bolts; but the sections may be made Without such portions without departing from the principle of my invention. I have also shown the sections of the bolt-anchors as being semicylindrical in cross-section. It is obvious that they may be of any segmental, curved, or substantially fiat form, provided that when a sufficient number are assembled they constitute, substantially, a surrounding envelop or sleeve for the bolt, which will anchor it in place.

In Fig. 1 I show a bolt-anchor ot' my construction in place in a cavity 14 of a wall 15, the sections 1 1 having been expanded by the forward rotation of the bolt completely to fill the cavity and the bolt being thus firmly held in place. I have also shown the corrugations or iiutings of the sections 1 1 in spiral form, and this is the form which I prefer. It any other than a spiral form is employed-for instance, a series of annular iiutings-the threads of the bolts will cut across the depressions of the crrugations. rlhis in some cases would be desirable, especially where an unusually iirm grip were desired; but commonly it would not be necessary.

In Figs. 5 to 10, inclusive, I have illustrated a modified form of my bolt-anchor. In this form the noncorrugated or non-fluted portions 2 2 are not only provided at the outer ends of the anchor-sections, but are provided at portions 22 22 intermediate the corrugated or iiuted portions; otherwise the construction of the anchor-sections is the same as heretofore described. The purpose of providing these non corrugated portions is to enable the same series of sections to be used with bolts having a dilferent number of threads to the inch. For example, in Fig. 9 I show a bolt 3l, having a certain number of threads to the inch. So far as engaging with the spiral corrugations of the section in which it is placed is concerned these corrugations might be continued past the intermediate non-corrugated portions 22a and 22". In Fig. 10, however, I show the same section with thenon-corrugated portions 22a and 22b intermediate the corrugated portions and engaging a screw 32, having a greater number ot threads to the inch. The threads of this screw engage the corrugated portions to a certain extent about as readily as the bolt 31 engaged the same corrugated portions; but a point is soon reached at which the threads of the screw 32 would cross the corrugations if they were continued. I therefore interrupt the corrugations and substitute the non-corrugated portions 22zt until I reach a point where the spiral corrugations again coincide substantially with the slope of the threads of the bolt 32. This Icontinue until I reach the gradually increase in thickness toward their o inner ends and forming, when assembled, a corrugated tube tapering internally toward its inner end and each provided with a smooth non-corrugated portion at its outer end.

2. Abolt-anchor consisting of a plurality of sections each composed of spirall y corrugated or i'luted metal, the walls of which gradually increase in thickness toward their inner ends, and forming, when assembled, aspirally-corrugated tube tapering internally toward its inner end, and each provided with a smooth non-corrugated portion at its outer end.

3. Abolt-anchor consisting of aplurality of sections each composed of alternately corrugated and non-corrugated portions.

4f. Abolt-anchor consisting of a plurality of sections each composed of alternately spirallycorrugated and non-corrugated portions.

5. A bolt-anchor consisting of a plurality of sections each composed of alternately corrugated and non-corrugated portions and forming, when assembled, a tube adapted to receive a bolt.

6. Abolt-anchor consisting of a plurality of sections each composed of corrugated and non-corrugated portions and stamped simultaneously out of one piece of metal.

'7. A bolt-anchor consisting of a plurality of corrugated or tinted sections each made of metal and forming, when assembled, a tube, the outer edges of the corrugations being substantially tangent to the circumscribed cylinder and the inner edges of the same being substantially tangent to the frustum of the inclosed cone.

8. A bolt-anchor consisting of a plurality of sections each com posed of spirally-corrugated and non-corrugated portions and forming, when assembled, a tube, the corrugated parts of which are adapted to engage with the threads of bolts having a different number of threads to the inch.

Witness my hand this 7th day of October, 1902, at the city of New York, in the county and State of New York.

STEPHEN S. NEWTON.

Witnesses:

HERMAN MEYER, M. HYNDMAN.

IOO

lIO 

